Recent living, dead, and total foraminiferal populations in sediment samples collected by aqualung divers in the vicinity of Heald Bank, NW. Gulf of Mexico were studied. Fifty living species were identified; living specimens composed 35% of the total fauna. Comparisons of living, dead, and total populations permit valid ecological conclusions and suggest geological considerations on changing conditions and transportation of tests. Faunal variations within short lateral distances are appreciable.

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